man MIME::Decoder::Base64 () - encode/decode a "base64" stream


MIME::Decoder::Base64 - encode/decode a "base64" stream


A generic decoder object; see MIME::Decoder for usage.


A MIME::Decoder subclass for the CW"base64" encoding. The name was chosen to jibe with the pre-existing MIME::Base64 utility package, which this class actually uses to translate each chunk.

When decoding, the input is read one line at a time. The input accumulates in an internal buffer, which is decoded in multiple-of-4-sized chunks (plus a possible leftover input chunk, of course).
When encoding, the input is read 45 bytes at a time: this ensures that the output lines are not too long. We chose 45 since it is a multiple of 3 and produces lines under 76 characters, as RFC-1521 specifies.


Eryq (, ZeeGee Software Inc (

All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.


$Revision: 1.9 $ CW$Date: 2005/12/22 14:56:59 $